From the question it is given that 324
Now, we subtract successive odd numbers starting from 1 as:
324 – 1 = 323
323 – 3 = 320
320 – 5 = 315
315 – 7 = 308
308 – 9 = 299
299 – 11 = 288
288 – 13 = 275
275 – 15 = 260
260 – 17 = 243
243 – 19 = 224
224 – 21 = 203
203 – 23 = 180
180 – 25 = 155
155 – 27 = 128
128 – 29 = 99
99 – 31 = 68
68 – 33 = 35
35 – 35 = 0
Here we see 324 reduces to 0 after subtracting 18 odd numbers.
Therefore the square root of 324 is 18.